High-fidelity Two-qubit Gates and Noise Spectroscopy with Superconducting Qubits
Although there has been tremendous progress toward achieving low error rates with superconducting qubits, error-prone gates remain the bottleneck in realizing quantum computing applications. To build robust quantum computers, it is crucial to identify the dominant sources of errors and suppress them...
| Автор: | |
|---|---|
| Інші автори: | |
| Формат: | Дисертація |
| Опубліковано: |
Massachusetts Institute of Technology
2022
|
| Онлайн доступ: | https://hdl.handle.net/1721.1/144591 https://orcid.org/ 0000-0002-1342-9354 |
| _version_ | 1826203980034736128 |
|---|---|
| author | Sung, Youngkyu |
| author2 | Oliver, William D. |
| author_facet | Oliver, William D. Sung, Youngkyu |
| author_sort | Sung, Youngkyu |
| collection | MIT |
| description | Although there has been tremendous progress toward achieving low error rates with superconducting qubits, error-prone gates remain the bottleneck in realizing quantum computing applications. To build robust quantum computers, it is crucial to identify the dominant sources of errors and suppress them by engineering the control and architecture of qubit systems. In this thesis, we implement a tunable coupler and noise spectroscopy with the goal of achieving high-fidelity two-qubit gates and characterizing underlying noise mechanisms in superconducting qubits, respectively. We engineer various control techniques---including a fast adiabatic control and spin-locking noise spectroscopy---by incorporating the impact of higher energy levels of a qubit and coupler. Specifically, we harness the higher levels of a coupler as a resource to cancel out an unwanted ZZ interaction between qubits, and thereby improving the two-qubit gate fidelity. In addition, we exploit the multiple level transitions of a transmon sensor to distinguish the noise contributions from flux and photon shot noise. The control protocols developed in this thesis may help resolve hardware challenges in building quantum computers with low error rates. |
| first_indexed | 2024-09-23T12:46:56Z |
| format | Thesis |
| id | mit-1721.1/144591 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T12:46:56Z |
| publishDate | 2022 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/1445912022-08-30T03:33:35Z High-fidelity Two-qubit Gates and Noise Spectroscopy with Superconducting Qubits Sung, Youngkyu Oliver, William D. Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Although there has been tremendous progress toward achieving low error rates with superconducting qubits, error-prone gates remain the bottleneck in realizing quantum computing applications. To build robust quantum computers, it is crucial to identify the dominant sources of errors and suppress them by engineering the control and architecture of qubit systems. In this thesis, we implement a tunable coupler and noise spectroscopy with the goal of achieving high-fidelity two-qubit gates and characterizing underlying noise mechanisms in superconducting qubits, respectively. We engineer various control techniques---including a fast adiabatic control and spin-locking noise spectroscopy---by incorporating the impact of higher energy levels of a qubit and coupler. Specifically, we harness the higher levels of a coupler as a resource to cancel out an unwanted ZZ interaction between qubits, and thereby improving the two-qubit gate fidelity. In addition, we exploit the multiple level transitions of a transmon sensor to distinguish the noise contributions from flux and photon shot noise. The control protocols developed in this thesis may help resolve hardware challenges in building quantum computers with low error rates. Ph.D. 2022-08-29T15:57:52Z 2022-08-29T15:57:52Z 2022-05 2022-06-21T19:16:02.985Z Thesis https://hdl.handle.net/1721.1/144591 https://orcid.org/ 0000-0002-1342-9354 In Copyright - Educational Use Permitted Copyright MIT http://rightsstatements.org/page/InC-EDU/1.0/ application/pdf Massachusetts Institute of Technology |
| spellingShingle | Sung, Youngkyu High-fidelity Two-qubit Gates and Noise Spectroscopy with Superconducting Qubits |
| title | High-fidelity Two-qubit Gates and Noise Spectroscopy with Superconducting Qubits |
| title_full | High-fidelity Two-qubit Gates and Noise Spectroscopy with Superconducting Qubits |
| title_fullStr | High-fidelity Two-qubit Gates and Noise Spectroscopy with Superconducting Qubits |
| title_full_unstemmed | High-fidelity Two-qubit Gates and Noise Spectroscopy with Superconducting Qubits |
| title_short | High-fidelity Two-qubit Gates and Noise Spectroscopy with Superconducting Qubits |
| title_sort | high fidelity two qubit gates and noise spectroscopy with superconducting qubits |
| url | https://hdl.handle.net/1721.1/144591 https://orcid.org/ 0000-0002-1342-9354 |
| work_keys_str_mv | AT sungyoungkyu highfidelitytwoqubitgatesandnoisespectroscopywithsuperconductingqubits |